George, I've never heard (or even seen) a plasma tweeter, so an ESL or ribbon driven by tubes is as good as I've heard. Transparent, grain-free purity, but only if the amp is capable of producing high frequencies at low distortion. As the OP has learned, not all are.
Rogue Atlas Magnum sounds bright -- any recommendations?
Gents, I need some help here. I am making a move back to a tube amp, in place of my McCormack DNA .05. I just acquired a early version of the Atlas Magnum with KT90's and it sounds excessively bright to my ears. It has stock tubes. I have a Don Sachs preamp driving my Spatial Audio M4 Triode Masters.
I need to tame this brightness to better enjoy this amp. Thanks for any input you can provide.
I need to tame this brightness to better enjoy this amp. Thanks for any input you can provide.